Admin-message-send

Api:/api/admin/message/send

Methods:POST

Permission:unlimited

Login auth:Yes

Request and parameters:

"""
    POST
        发送消息
        title:<title>,标题
        content:<str>,正文
        content_html:<str>,正文html
        send_type:<array>,发送类型on_site, email, sms . 如:["email"], 也可以同时发送多个个["email", "on_site"]
        username:<array>, 接收信息的用户名, 如["test", "test2"]
    :return: